It calls for a box of vanilla cake mix, plus a couple of packs of instant pistachio pudding (one for the cake and another for the frosting), some Cool Whip, milk, and eggs. I also picked up green ...

Melt the butter in the microwave, about 1 minute. In a large bowl add the yellow cake mix, the first box of instant pistachio pudding mix, eggs, club soda and melted butter. Stir until fully mixed ...